Title:
浸炭部品およびその製造方法
Document Type and Number:
Japanese Patent JP5378512
Kind Code:
B2
Abstract:
A carburized component has improved fatigue strength in a "low to medium cycle region", wherein base steel is a steel having a chemical composition containing, by mass%, C: 0.15-0.25%, Si: 0.03-0.50%, Mn: more than 0.60% and not more than 1.5%, P¤0.015%, S: 0.006-0.030%, Cr: 0.05-2.0%, Al¤0.10%, N¤0.03%, and O¤0.0020%, and optionally at least one element selected from Mo, Cu, Ni, B, Ti, Nb and V, the balance being Fe and impurities, wherein a surface hardened layer portion satisfies following conditions of (a) an average carbon concentration in the region from the outermost surface to a point of 0.2 mm depth: by mass%, 0.35-0.60%, (b) surface roughness Rz¤15 µm, and (c) Ãr(0) ¤-800 MPa, Ãr(100) ¤-800MPa, and residual stress intensity index Ir¥80000. The residual stress intensity index Ir is calculated by [Ir = «|Ãr(y)|dy], where y µm is the depth from the outermost surface and Ãr(y) is the residual stress for the points from the outermost surface to a depth of 100 µm. Here, the integration interval, that is, the range of y is 0 to 100 (µm).
Inventors:
Yutaka Neishi
Takanari Hamada
Hidekazu Sueno
Yuji Kobayashi
Hideaki Sugiura
Takanari Hamada
Hidekazu Sueno
Yuji Kobayashi
Hideaki Sugiura
Application Number:
JP2011516033A
Publication Date:
December 25, 2013
Filing Date:
May 26, 2010
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
Shinto Industry Co., Ltd.
Shinto Industry Co., Ltd.
International Classes:
C22C38/00; B24C1/10; C21D1/06; C21D7/06; C21D9/28; C21D9/32; C21D9/40; C22C38/18; C22C38/54; C23C8/22
Domestic Patent References:
| JP2008261037A | 2008-10-30 | |||
| JP2008248284A | 2008-10-16 | |||
| JP2007307678A | 2007-11-29 |
Attorney, Agent or Firm:
Mikiji Sugioka
Chihara
Chihara